The cups held one cover, but we buy them in a stack

They used our panel for the seal test but not our stack; I've asked them to include the actual supply condition, including the occasional sheets that stick together.

Ask how a double pickup will be detected and handled within the approved system design. Vacuum achieved does not by itself establish that exactly one sheet is present.

Their first answer was that the vacuum reading would tell them. I asked for evidence of that with two stuck covers and they are reviewing it with the tooling engineer.

That review needs representative double-sheet cases and defined detection criteria. Do not accept the assumption simply because the single-sheet test passed.

Include the actual panel variation in that assessment. A stiff sample from the top of the pile may not represent the least supported cover you expect to handle.

Has the supplier sent a revised trial scope covering those points? Separation, support and release should have distinct observations and acceptance criteria.

Yes, draft arrived. It includes stuck pairs and a supported transfer review, but release just says 'places successfully', so I've asked how they'll judge seating and any marks afterwards.

Does the draft include who reloads the stack and how long that takes, even if the handling checks all pass?

It didn't. Added a refill walkthrough with our operator, thanks. We're still agreeing the trial; no automatic stack handling has been signed off from that original seal test.

Keep the original sealing result in its proper scope. It remains useful evidence for one aspect of the tool, even though the application needs these further checks.